Definition of cislunar
:lying between the earth and the moon or the moon's orbit
- cislunar space
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Step two involves the international spaceflight community coming together to build cyclers that ply cislunar space, taking people on trips to the moon and back.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cislunar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of cislunar
circa 1877
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